import { Element } from "hast";
import { CustomizationHook } from "./customization-hooks";
import { HeadingTagName, ListItem } from "./types";
/**
 * The different positions at which the table of contents can be inserted,
 * relative to the `<main>` element.
 */
export declare type InsertPosition = "beforebegin" | "afterbegin" | "beforeend" | "afterend";
/**
 * Options for the Rehype TOC plugin
 */
export interface Options {
    /**
     * Determines whether the table of contents is wrapped in a `<nav>` element.
     *
     * Defaults to `true`.
     */
    nav?: boolean;
    /**
     * The position at which the table of contents should be inserted, relative to the `<main>`
     * element.
     *
     * Defaults to "afterbegin";
     *
     * @see https://developer.mozilla.org/en-US/docs/Web/API/Element/insertAdjacentElement
     */
    position?: InsertPosition;
    /**
     * The optional placeholder string to replace with the table of contents.
     *
     * Defaults to `undefined`;
     */
    placeholder?: string | undefined;
    /**
     * HTML heading elements to include in the table of contents.
     *
     * Defaults to all headings ("h1" through "h6").
     */
    headings?: HeadingTagName[];
    /**
     * CSS class names for various parts of the table of contents.
     */
    cssClasses?: CssClasses;
    /**
     * Allows you to customize the table of contents before it is added to the page.
     *
     * @param toc - The table of contents HAST node tree
     * @returns - Return the modified node, a new node to replace it with, or `undefined` to use the
     * existing node. You can return a falsy value to prevent the table of contents from being added
     * to the page.
     */
    customizeTOC?(toc: Element): Element | boolean | undefined;
    /**
     * Allows you to customize an item before it is added to the table of contents.
     *
     * @param tocItem - A HAST node tree containing an `<li>` and `<a>`
     * @param heading - The original heading (e.g. `<h1>`, `<h2>`, etc.) that `tocItem` is a referene to
     *
     * @returns - Return the modified node, a new node to replace it with, or `undefined` to use the
     * existing node. You can return a falsy value to prevent the item from being added to the
     * table of contents.
     */
    customizeTOCItem?(tocItem: ListItem, heading: Element): Element | boolean | undefined;
}
/**
 * CSS class names for various parts of the table of contents.
 */
export interface CssClasses {
    /**
     * The CSS class name for the top-level `<nav>` or `<ol>` element that contains the whole table of contents.
     *
     * Defaults to "toc".
     */
    toc?: string;
    /**
     * The CSS class name for all `<ol>` elements in the table of contents, including the top-level one.
     *
     * Defaults to "toc-level", which also adds "toc-level-1", "toc-level-2", etc.
     */
    list?: string;
    /**
     * The CSS class name for all `<li>` elements in the table of contents.
     *
     * Defaults to "toc-item", which also adds "toc-item-h1", "toc-item-h2", etc.
     */
    listItem?: string;
    /**
     * The CSS class name for all `<a>` elements in the table of contents.
     *
     * Defaults to "toc-link", which also adds "toc-link-h1", "toc-link-h2", etc.
     */
    link?: string;
}
/**
 * Normalized, sanitized, and complete settings,
 * with default values for anything that wasn't specified by the caller.
 */
export declare class NormalizedOptions {
    readonly nav: boolean;
    readonly position: InsertPosition;
    readonly headings: HeadingTagName[];
    readonly cssClasses: Required<CssClasses>;
    readonly placeholder?: string | undefined;
    readonly customizeTOC?: CustomizationHook;
    readonly customizeTOCItem?: CustomizationHook;
    /**
     * Applies default values for any unspecified options
     */
    constructor(options?: Options);
}
/**
 * Builds a CSS class string from the given user-defined class name
 */
export declare function buildClass(name: string, suffix: string | number): string | undefined;